drivers/media/video/pvrusb2/pvrusb2-video-v4l.c

   1 /*
   2  *
   3  *  $Id$
   4  *
   5  *  Copyright (C) 2005 Mike Isely <isely@pobox.com>
   6  *  Copyright (C) 2004 Aurelien Alleaume <slts@free.fr>
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software
  19  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  *
  21  */
  22
  23 /*
  24
  25    This source file is specifically designed to interface with the
  26    saa711x support that is available in the v4l available starting
  27    with linux 2.6.15.
  28
  29 */
  30
  31 #include "pvrusb2-video-v4l.h"
  32 #include "pvrusb2-i2c-cmd-v4l2.h"
  33
  34
  35 #include "pvrusb2-hdw-internal.h"
  36 #include "pvrusb2-debug.h"
  37 #include <linux/videodev2.h>
  38 #include <media/v4l2-common.h>
  39 #include <media/saa7115.h>
  40 #include <linux/errno.h>
  41 #include <linux/slab.h>
  42
  43 struct pvr2_v4l_decoder {
  44         struct pvr2_i2c_handler handler;
  45         struct pvr2_decoder_ctrl ctrl;
  46         struct pvr2_i2c_client *client;
  47         struct pvr2_hdw *hdw;
  48         unsigned long stale_mask;
  49 };
  50
  51
  52 static void set_input(struct pvr2_v4l_decoder *ctxt)
  53 {
  54         struct pvr2_hdw *hdw = ctxt->hdw;
  55         struct v4l2_routing route;
  56
  57         pvr2_trace(PVR2_TRACE_CHIPS,"i2c v4l2 set_input(%d)",hdw->input_val);
  58         switch(hdw->input_val) {
  59         case PVR2_CVAL_INPUT_TV:
  60                 route.input = SAA7115_COMPOSITE4;
  61                 break;
  62         case PVR2_CVAL_INPUT_COMPOSITE:
  63                 route.input = SAA7115_COMPOSITE5;
  64                 break;
  65         case PVR2_CVAL_INPUT_SVIDEO:
  66                 route.input = SAA7115_SVIDEO2;
  67                 break;
  68         case PVR2_CVAL_INPUT_RADIO:
  69                 // ????? No idea yet what to do here
  70         default:
  71                 return;
  72         }
  73         route.output = 0;
  74         pvr2_i2c_client_cmd(ctxt->client,VIDIOC_INT_S_VIDEO_ROUTING,&route);
  75 }
  76
  77
  78 static int check_input(struct pvr2_v4l_decoder *ctxt)
  79 {
  80         struct pvr2_hdw *hdw = ctxt->hdw;
  81         return hdw->input_dirty != 0;
  82 }
  83
  84
  85 static void set_audio(struct pvr2_v4l_decoder *ctxt)
  86 {
  87         u32 val;
  88         struct pvr2_hdw *hdw = ctxt->hdw;
  89
  90         pvr2_trace(PVR2_TRACE_CHIPS,"i2c v4l2 set_audio %d",
  91                    hdw->srate_val);
  92         switch (hdw->srate_val) {
  93         default:
  94         case PVR2_CVAL_SRATE_48:
  95                 val = 48000;
  96                 break;
  97         case PVR2_CVAL_SRATE_44_1:
  98                 val = 44100;
  99                 break;
 100         }
 101         pvr2_i2c_client_cmd(ctxt->client,VIDIOC_INT_AUDIO_CLOCK_FREQ,&val);
 102 }
 103
 104
 105 static int check_audio(struct pvr2_v4l_decoder *ctxt)
 106 {
 107         struct pvr2_hdw *hdw = ctxt->hdw;
 108         return hdw->srate_dirty != 0;
 109 }
 110
 111
 112 struct pvr2_v4l_decoder_ops {
 113         void (*update)(struct pvr2_v4l_decoder *);
 114         int (*check)(struct pvr2_v4l_decoder *);
 115 };
 116
 117
 118 static const struct pvr2_v4l_decoder_ops decoder_ops[] = {
 119         { .update = set_input, .check = check_input},
 120         { .update = set_audio, .check = check_audio},
 121 };
 122
 123
 124 static void decoder_detach(struct pvr2_v4l_decoder *ctxt)
 125 {
 126         ctxt->client->handler = 0;
 127         ctxt->hdw->decoder_ctrl = 0;
 128         kfree(ctxt);
 129 }
 130
 131
 132 static int decoder_check(struct pvr2_v4l_decoder *ctxt)
 133 {
 134         unsigned long msk;
 135         unsigned int idx;
 136
 137         for (idx = 0; idx < sizeof(decoder_ops)/sizeof(decoder_ops[0]);
 138              idx++) {
 139                 msk = 1 << idx;
 140                 if (ctxt->stale_mask & msk) continue;
 141                 if (decoder_ops[idx].check(ctxt)) {
 142                         ctxt->stale_mask |= msk;
 143                 }
 144         }
 145         return ctxt->stale_mask != 0;
 146 }
 147
 148
 149 static void decoder_update(struct pvr2_v4l_decoder *ctxt)
 150 {
 151         unsigned long msk;
 152         unsigned int idx;
 153
 154         for (idx = 0; idx < sizeof(decoder_ops)/sizeof(decoder_ops[0]);
 155              idx++) {
 156                 msk = 1 << idx;
 157                 if (!(ctxt->stale_mask & msk)) continue;
 158                 ctxt->stale_mask &= ~msk;
 159                 decoder_ops[idx].update(ctxt);
 160         }
 161 }
 162
 163
 164 static int decoder_detect(struct pvr2_i2c_client *cp)
 165 {
 166         /* Attempt to query the decoder - let's see if it will answer */
 167         struct v4l2_tuner vt;
 168         int ret;
 169
 170         memset(&vt,0,sizeof(vt));
 171         ret = pvr2_i2c_client_cmd(cp,VIDIOC_G_TUNER,&vt);
 172         return ret == 0; /* Return true if it answered */
 173 }
 174
 175
 176 static void decoder_enable(struct pvr2_v4l_decoder *ctxt,int fl)
 177 {
 178         pvr2_trace(PVR2_TRACE_CHIPS,"i2c v4l2 decoder_enable(%d)",fl);
 179         pvr2_v4l2_cmd_stream(ctxt->client,fl);
 180 }
 181
 182
 183 static int decoder_is_tuned(struct pvr2_v4l_decoder *ctxt)
 184 {
 185         struct v4l2_tuner vt;
 186         int ret;
 187
 188         memset(&vt,0,sizeof(vt));
 189         ret = pvr2_i2c_client_cmd(ctxt->client,VIDIOC_G_TUNER,&vt);
 190         if (ret < 0) return -EINVAL;
 191         return vt.signal ? 1 : 0;
 192 }
 193
 194
 195 static unsigned int decoder_describe(struct pvr2_v4l_decoder *ctxt,char *buf,unsigned int cnt)
 196 {
 197         return scnprintf(buf,cnt,"handler: pvrusb2-video-v4l");
 198 }
 199
 200
 201 const static struct pvr2_i2c_handler_functions hfuncs = {
 202         .detach = (void (*)(void *))decoder_detach,
 203         .check = (int (*)(void *))decoder_check,
 204         .update = (void (*)(void *))decoder_update,
 205         .describe = (unsigned int (*)(void *,char *,unsigned int))decoder_describe,
 206 };
 207
 208
 209 int pvr2_i2c_decoder_v4l_setup(struct pvr2_hdw *hdw,
 210                                struct pvr2_i2c_client *cp)
 211 {
 212         struct pvr2_v4l_decoder *ctxt;
 213
 214         if (hdw->decoder_ctrl) return 0;
 215         if (cp->handler) return 0;
 216         if (!decoder_detect(cp)) return 0;
 217
 218         ctxt = kmalloc(sizeof(*ctxt),GFP_KERNEL);
 219         if (!ctxt) return 0;
 220         memset(ctxt,0,sizeof(*ctxt));
 221
 222         ctxt->handler.func_data = ctxt;
 223         ctxt->handler.func_table = &hfuncs;
 224         ctxt->ctrl.ctxt = ctxt;
 225         ctxt->ctrl.detach = (void (*)(void *))decoder_detach;
 226         ctxt->ctrl.enable = (void (*)(void *,int))decoder_enable;
 227         ctxt->ctrl.tuned = (int (*)(void *))decoder_is_tuned;
 228         ctxt->client = cp;
 229         ctxt->hdw = hdw;
 230         ctxt->stale_mask = (1 << (sizeof(decoder_ops)/
 231                                   sizeof(decoder_ops[0]))) - 1;
 232         hdw->decoder_ctrl = &ctxt->ctrl;
 233         cp->handler = &ctxt->handler;
 234         pvr2_trace(PVR2_TRACE_CHIPS,"i2c 0x%x saa711x V4L2 handler set up",
 235                    cp->client->addr);
 236         return !0;
 237 }
 238
 239
 240
 241
 242 /*
 243   Stuff for Emacs to see, in order to encourage consistent editing style:
 244   *** Local Variables: ***
 245   *** mode: c ***
 246   *** fill-column: 70 ***
 247   *** tab-width: 8 ***
 248   *** c-basic-offset: 8 ***
 249   *** End: ***
 250   */